Article Search Results

A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

This specimen was revealed to be a synthetic star sapphire.

Synthetic Sapphire with Diffusion-Induced Colour and Star

Sutas Singbamroong, Nazar Ahmed, and Nahla Al Muhairi, July 31, 2015

Diffusion treatment is used to induce colour and asterism in a colourless synthetic sapphire.

Beryllium Diffusion of Ruby and Sapphire

John L. Emmett, et al., June 1, 2003

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

Article

Autumn 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Colour Change in Blue Zircon

Jennifer-Lynn Archuleta, October 31, 2016

A summary of the content found in the Autumn 2016 issue of Gems & Gemology.

Article

Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

Russell Shor, June 12, 2015

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

Article

Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

Russell Shor, August 14, 2015

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

Article

Update on the Rock Creek Sapphire Deposit

Warren Boyd, June 17, 2015

An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

Heat Treating the Sapphires of Rock Creek, Montana

John L. Emmett and Troy R. Douthit, September 1, 1993

Renewed interest in large-scale commercial mining of Montana sapphires motivated a detailed study of the heat treatment of sapphire from the Rock Creek deposit.

Sapphires from Australia

Terrence Coldham, September 1, 1985

An overview of Australia's recent significance in the production of blue sapphire.

Article Search Results

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Gemstones

Article Search Results

Types

Content Type

Reviewed

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Gemstones

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